Storage router and method for providing virtual local storage

ABSTRACT

A storage router ( 56 ) and storage network ( 50 ) provide virtual local storage on remote SCSI storage devices ( 60, 62, 64 ) to Fiber Channel devices. A plurality of Fiber Channel devices, such as workstations ( 58 ), are connected to a Fiber Channel transport medium ( 52 ), and a plurality of SCSI storage devices ( 60, 62, 64 ) are connected to a SCSI bus transport medium ( 54 ) The storage router ( 56 ) interfaces between the Fiber Channel transport medium ( 52 ) and the SCSI bus transport medium ( 54 ). The storage router ( 56 ) maps between the workstations ( 58 ) and the SCSI storage devices ( 60, 62, 64 ) and implements access controls for storage space on the SCSI storage devices ( 60, 62, 64 ). The storage router ( 56 ) then allows access from the workstations ( 58 ) to the SCSI storage devices ( 60, 62, 64 ) using native low level, block protocol in accordance with the mapping and the access controls.

This application is a continuation of, and claims a benefit of priority under 35 U.S.C. 120 of the filing date of U.S. patent application Ser. No. 11/851,837 entitled “Storage Router and Method for Providing Virtual Local Storage” filed on Sep. 7, 2007, now U.S. Pat. No. 7,694,058, which is a continuation of Ser. No. 11/442,878 entitled “Storage Router and Method for Providing Virtual Local Storage” filed May 30, 2006, now abandoned, which is a continuation of Ser. No. 11/353,826, entitled “Storage Router and Method for Providing Virtual Local Storage” filed on Feb. 14, 2006, now U.S. Pat. No. 7,340,549, which is a continuation of and claims the benefit of priority of U.S. patent application Ser. No. 10/658,163 entitled “Storage Router and Method for Providing Virtual Local Storage” filed on Sep. 9, 2003, now U.S. Pat. No. 7,051,147, which is a continuation of and claims the benefit of benefit of priority of U.S. patent application Ser. No. 10/081,110 by inventors Geoffrey B. Hoese and Jeffery T. Russell, entitled “Storage Router and Method for Providing Virtual Local Storage” filed on Feb. 22, 2002, now U.S. Pat. No. 6,789,152, which in turn is a continuation of and claims benefit of priority of U.S. application Ser. No. 09/354,682 by inventors Geoffrey B. Hoese and Jeffrey T. Russell, entitled “Storage Router and Method for Providing Virtual Local Storage” filed on Jul. 15, 1999, now U.S. Pat. No. 6,421,753, which in turn is a continuation of and claims benefit of priority of U.S. patent application Ser. No. 09/001,799, filed on Dec. 31, 1997, now U.S. Pat. No. 5,941,972, and hereby incorporates these applications and patents by reference in their entireties as if they had been fully set forth herein.

TECHNICAL FIELD OF THE INVENTION

This invention relates in general to network storage devices, and more particularly to a storage router and method for providing virtual local storage on remote SCSI storage devices to Fibre Channel devices.

BACKGROUND OF THE INVENTION

Typical storage transport mediums provide for a relatively small number of devices to be attached over relatively short distances. One such transport medium is a Small Computer System Interface (SCSI) protocol, the structure and operation of which is generally well known as is described, for example, in the SCSI-1, SCSI-2 and SCSI-3 specifications. High speed serial interconnects provide enhanced capability to attach a large number of high speed devices to a common storage transport medium over large distances. One such serial interconnect is Fibre Channel, the structure and operation of which is described, for example, in Fibre Channel Physical and Signaling Interface (FC-PH), ANSI X3.230 Fibre Channel Arbitrated Loop (FC-AL), and ANSI X3.272 Fibre Channel Private Loop Direct Attach (FC-PLDA).

Conventional computing devices, such as computer workstations, generally access storage locally or through network interconnects. Local storage typically consists of a disk drive, tape drive, CD-ROM drive or other storage device contained within, or locally connected to the workstation. The workstation provides a file system structure that includes security controls, with access to the local storage device through native low level block protocols. These protocols map directly to the mechanisms used by the storage device and consist of data requests without security controls. Network interconnects typically provide access for a large number of computing devices to data storage on a remote network server. The remote network server provides file system structure, access control, and other miscellaneous capabilities that include the network interface. Access to data through the network server is through network protocols that the server must translate into low level requests to the storage device. A workstation with access to the server storage must translate its file system protocols into network protocols that are used to communicate with the server. Consequently, from the perspective of a workstation, or other computing device, seeking to access such server data, the access is much slower than access to data on a local storage device.

SUMMARY OF THE INVENTION

In accordance with the present invention, a storage router and method for providing virtual local storage on remote SCSI storage devices to Fibre Channel devices are disclosed that provide advantages over conventional network storage devices and methods.

According to one aspect of the present invention, a storage router and storage network provide virtual local storage on remote SCSI storage devices to Fibre Channel devices. A plurality of Fibre Channel devices, such as workstations, are connected to a Fibre Channel transport medium, and a plurality of SCSI storage devices are connected to a SCSI bus transport medium. The storage router interfaces between the Fibre Channel transport medium and the SCSI bus transport medium. The storage router maps between the workstations and the SCSI storage devices and implements access controls for storage space on the SCSI storage devices. The storage router then allows access from the workstations to the SCSI storage devices using native low level, block protocol in accordance with the mapping and the access controls.

According to another aspect of the present invention, virtual local storage on remote SCSI storage devices is provided to Fibre Channel devices. A Fibre Channel transport medium and a SCSI bus transport medium are interfaced with. A configuration is maintained for SCSI storage devices connected to the SCSI bus transport medium. The configuration maps between Fibre Channel devices and the SCSI storage devices and implements access controls for storage space on the SCSI storage devices. Access is then allowed from Fibre Channel initiator devices to SCSI storage devices using native low level, block protocol in accordance with the configuration.

A technical advantage of the present invention is the ability to centralize local storage for networked workstations without any cost of speed or overhead. Each workstation accesses its virtual local storage as if it were locally connected. Further, the centralized storage devices can be located in a significantly remote position even in excess of ten kilometers as defined by Fibre Channel standards.

Another technical advantage of the present invention is the ability to centrally control and administer storage space for connected users without limiting the speed with which the users can access local data. In addition, global access to data, backups, virus scanning and redundancy can be more easily accomplished by centrally located storage devices.

A further technical advantage of the present invention is providing support for SCSI storage devices as local storage for Fibre Channel hosts. In addition, the present invention helps to provide extended capabilities for Fibre Channel and for management of storage subsystems.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete understanding of the present invention and the advantages thereof may be acquired by referring to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features, and wherein:

FIG. 1 is a block diagram of a conventional network that provides storage through a network server;

FIG. 2 is a block diagram of one embodiment of a storage network with a storage router that provides global access and routing;

FIG. 3 is a block diagram of one embodiment of a storage network with a storage router that provides virtual local storage;

FIG. 4 is a block diagram of one embodiment of the storage router of FIG. 3; and

FIG. 5 is a block diagram of one embodiment of data flow within the storage router of FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a block diagram of a conventional network, indicated generally at 10, that provides access to storage through a network server. As shown, network 10 includes a plurality of workstations 12 interconnected with a network server 14 via a network transport medium 16. Each workstation 12 can generally comprise a processor, memory, input/output devices, storage devices and a network adapter as well as other common computer components. Network server 14 uses a SCSI bus 18 as a storage transport medium to interconnect with a plurality of storage devices 20 (tape drives, disk drives, etc.). In the embodiment of FIG. 1, network transport medium 16 is a network connection and storage devices 20 comprise hard disk drives, although there are numerous alternate transport mediums and storage devices.

In network 10, each workstation 12 has access to its local storage device as well as network access to data on storage devices 20. The access to a local storage device is typically through native low level, block protocols. On the other hand, access by a workstation 12 to storage devices 20 requires the participation of network server 14 which implements a file system and transfers data to workstations 12 only through high level file system protocols. Only network server 14 communicates with storage devices 20 via native low level, block protocols. Consequently, the network access by workstations 12 through network server 14 is slow with respect to their access to local storage. In network 10, it can also be a logistical problem to centrally manage and administer local data distributed across an organization, including accomplishing tasks such as backups, virus scanning and redundancy.

FIG. 2 is a block diagram of one embodiment of a storage network, indicated generally at 30, with a storage router that provides global access and routing. This environment is significantly different from that of FIG. 1 in that there is no network server involved. In FIG. 2, a Fibre Channel high speed serial transport 32 interconnects a plurality of workstations 36 and storage devices 38. A SCSI bus storage transport medium interconnects workstations 40 and storage devices 42. A storage router 44 then serves to interconnect these mediums and provide devices on either medium global, transparent access to devices on the other medium. Storage router 44 routes requests from initiator devices on one medium to target devices on the other medium and routes data between the target and the initiator. Storage router 44 can allow initiators and targets to be on either side. In this manner, storage router 44 enhances the functionality of Fibre Channel 32, by providing access, for example, to legacy SCSI storage devices on SCSI bus 34. In the embodiment of FIG. 2, the operation of storage router 44 can be managed by a management station 46 connected to the storage router via a direct serial connection.

In storage network 30, any workstation 36 or workstation 40 can access any storage device 38 or storage device 42 through native low level, block protocols, and vice versa. This functionality is enabled by storage router 44 which routes requests and data as a generic transport between Fibre Channel 32 and SCSI bus 34. Storage router 44 uses tables to map devices from one medium to the other and distributes requests and data across Fibre Channel 32 and SCSI bus 34 without any security access controls. Although this extension of the high speed serial interconnect provided by Fibre Channel is beneficial, it is desirable to provide security controls in addition to extended access to storage devices through a native low level, block protocol.

FIG. 3 is a block diagram of one embodiment of a storage network, indicated generally at 50, with a storage router that provides virtual local storage. Similar to that of FIG. 2, storage network 50 includes a Fibre Channel high speed serial interconnect 52 and a SCSI bus 54 bridged by a storage router 56. Storage router 56 of FIG. 3 provides for a large number of workstations 58 to be interconnected on a common storage transport and to access common storage devices 60, 62 and 64 through native low level, block protocols.

According to the present invention, storage router 56 has enhanced functionality to implement security controls and routing such that each workstation 58 can have access to a specific subset of the overall data stored in storage devices 60, 62 and 64. This specific subset of data has the appearance and characteristics of local storage and is referred to herein as virtual local storage. Storage router 56 allows the configuration and modification of the storage allocated to each attached workstation 58 through the use of mapping tables or other mapping techniques.

As shown in FIG. 3, for example, storage device 60 can be configured to provide global data 65 which can be accessed by all workstations 58. Storage device 62 can be configured to provide partitioned subsets 66, 68, 70 and 72, where each partition is allocated to one of the workstations 58 (workstations A, B, C and D). These subsets 66, 68, 70 and 72 can only be accessed by the associated workstation 58 and appear to the associated workstation 58 as local storage accessed using native low level, block protocols. Similarly, storage device 64 can be allocated as storage for the remaining workstation 58 (workstation E).

Storage router 56 combines access control with routing such that each workstation 58 has controlled access to only the specified partition of storage device 62 which forms virtual local storage for the workstation 58. This access control allows security control for the specified data partitions. Storage router 56 allows this allocation of storage devices 60, 62 and 64 to be managed by a management station 76. Management station 76 can connect directly to storage router 56 via a direct connection or, alternately, can interface with storage router 56 through either Fibre Channel 52 or SCSI bus 54. In the latter case, management station 76 can be a workstation or other computing device with special rights such that storage router 56 allows access to mapping tables and shows storage devices 60, 62 and 64 as they exist physically rather than as they have been allocated.

The environment of FIG. 3 extends the concept of single workstation having locally connected storage devices to a storage network 50 in which workstations 58 are provided virtual local storage in a manner transparent to workstations 58. Storage router 56 provides centralized control of what each workstation 58 sees as its local drive, as well as what data it sees as global data accessible by other workstations 58. Consequently, the storage space considered by the workstation 58 to be its local storage is actually a partition (i.e., logical storage definition) of a physically remote storage device 60, 62 or 64 connected through storage router 56. This means that similar requests from workstations 58 for access to their local storage devices produce different accesses to the storage space on storage devices 60, 62 and 64. Further, no access from a workstation 58 is allowed to the virtual local storage of another workstation 58.

The collective storage provided by storage devices 60, 62 and 64 can have blocks allocated by programming means within storage router 56. To accomplish this function, storage router 56 can include routing tables and security controls that define storage allocation for each workstation 58. The advantages provided by implementing virtual local storage in centralized storage devices include the ability to do collective backups and other collective administrative functions more easily. This is accomplished without limiting the performance of workstations 58 because storage access involves native low level, block protocols and does not involve the overhead of high level protocols and file systems required by network servers.

FIG. 4 is a block diagram of one embodiment of storage router 56 of FIG. 3. Storage router 56 can comprise a Fibre Channel controller 80 that interfaces with Fibre Channel 52 and a SCSI controller 82 that interfaces with SCSI bus 54. A buffer 84 provides memory work space and is connected to both Fibre Channel controller 80 and to SCSI controller 82. A supervisor unit 86 is connected to Fibre Channel controller 80, SCSI controller 82 and buffer 84. Supervisor unit 86 comprises a microprocessor for controlling operation of storage router 56 and to handle mapping and-security access for requests between Fibre Channel 52 and SCSI bus 54.

FIG. 5 is a block diagram of one embodiment of data flow within storage router 56 of FIG. 4. As shown, data from Fibre Channel 52 is processed by a Fibre Channel (FC) protocol unit 88 and placed in a FIFO queue 90. A direct memory access (DMA) interface 92 then takes data out of FIFO queue 90 and places it in buffer 84. Supervisor unit 86 processes the data in buffer 84 as represented by supervisor processing 93. This processing involves mapping between Fibre Channel 52 and SCSI bus 54 and applying access controls and routing functions. A DMA interface 94 then pulls data from buffer 84 and places it into a buffer 96. A SCSI protocol unit 98 pulls data from buffer 96 and communicates the data on SCSI bus 54. Data flow in the reverse direction, from SCSI bus 54 to Fibre Channel 52, is accomplished in a reverse manner.

The storage router of the present invention is a bridge device that connects a Fibre Channel link directly to a SCSI bus and enables the exchange of SCSI command set information between application clients on SCSI bus devices and the Fibre Channel links. Further, the storage router applies access controls such that virtual local storage can be established in remote SCSI storage devices for workstations on the Fibre Channel link. In one embodiment, the storage router provides a connection for Fibre Channel links running the SCSI Fibre Channel Protocol (FCP) to legacy SCSI devices attached to a SCSI bus. The Fibre Channel topology is typically an Arbitrated Loop (FC_AL).

In part, the storage router enables a migration path Fibre Channel based, serial SCSI networks by providing connectivity for legacy SCSI bus devices. The storage router can be attached to a Fibre Channel Arbitrated Loop and a SCSI bus to support a number of SCSI devices. Using configuration settings, the storage router can make the SCSI bus devices available on the Fibre Channel network as FCP logical units. Once the configuration is defined, operation of the storage router is transparent to application clients. In this manner, the storage router can form an integral part of the migration to new Fibre Channel based networks while providing a means to continue using legacy SCSI devices.

In one implementation (not shown), the storage router can be a rack mount or free standing device with an internal power supply. The storage router can have a Fibre Channel and SCSI port, and a standard, detachable power cord can be used, the FC connector can be a copper DB9 connector, and the SCSI connector can be a 68-pin type. Additional modular jacks can be provided for a serial port and an 802.3 10BaseT port, i.e. twisted pair Ethernet, for management access. The SCSI port of the storage router an support SCSI direct and sequential access target devices and can support SCSI initiators, as well. The Fibre Channel port can interface to SCSI-3 FCP enabled devices and initiators.

To accomplish its functionality, one implementation of the storage router uses: a Fibre Channel interface based on the HEWLETT-PACKARD TACHYON HPFC-5000 controller and a GLM media interface; an Intel 80960RP processor, incorporating independent data and program memory spaces, and associated logic required to implement a stand alone processing system; and a serial port for debug and system configuration. Further, this implementation includes a SCSI interface supporting Fast-20 based on the SYMBIOS 53C8xx series SCSI controllers, and an operating system based upon the WIND RIVERS SYSTEMS VXWORKS or IXWORKS kernel, as determined by design. In addition, the storage router includes software as required to control basic functions of the various elements, and to provide appropriate translations between the FC and SCSI protocols.

The storage router has various modes of operation that are possible between FC and SCSI target and initiator combinations. These modes are: FC Initiator to SCSI Target; SCSI Initiator to FC Target; SCSI Initiator to SCSI Target; and FC Initiator to FC Target. The first two modes can be supported concurrently in a single storage router device and are discussed briefly below. The third mode can involve two storage router devices back to back and can serve primarily as a device to extend the physical distance beyond that possible via a direct SCSI connection. The last mode can be used to carry FC protocols encapsulated on other transmission technologies (e.g. ATM, SONET), or to act as a bridge between two FC loops (e.g. as a two port fabric).

The FC Initiator to SCSI Target mode provides for the basic configuration of a server using Fibre Channel to communicate with SCSI targets. This mode requires that a host system have an FC attached device and associated device drivers and software to generate SCSI-3 FCP requests. This system acts as an initiator using the storage router to communicate with SCSI target devices. The SCSI devices supported can include SCSI-2 compliant direct or sequential access (disk or tape) devices. The storage router serves to translate command and status information and transfer data between SCSI-3 FCP and SCSI-2, allowing the use of standard SCSI-2 devices in a Fibre Channel environment.

The SCSI Initiator to FC Target mode provides for the configuration of a server using SCSI-2 to communicate with Fibre Channel targets. This mode requires that a host system has a SCSI-2 interface and driver software to control SCSI-2 target devices. The storage router will connect to the SCSI-2 bus and respond as a target to multiple target IDs. Configuration information is required to identify the target IDs to which the bridge will respond on the SCSI-2 bus. The storage router then translates the SCSI-2 requests to SCSI-3 FCP requests, allowing the use of FC devices with a SCSI host system. This will also allow features such as a tape device acting as an initiator on the SCSI bus to provide full support for this type of SCSI device.

In general, user configuration of the storage router will be needed to support various functional modes of operation. Configuration can be modified, for example, through a serial port or through an Ethernet port via SNMP (simple network management protocol) or the Telnet session. Specifically, SNMP manageability can be provided via a B02.3 Ethernet interface. This can provide for configuration changes as well as providing statistics and error information. Configuration can also be performed via TELNET or RS-232 interfaces with menu driven command interfaces. Configuration information can be stored in a segment of flash memory and can be retained across resets and power off cycles. Password protection can also be provided.

In the first two modes of operation, addressing information is needed to map from FC addressing to SCSI addressing and vice versa. This can be ‘hard’ configuration data, due to the need for address information to be maintained across initialization and partial reconfigurations of the Fibre Channel address space. In an arbitrated loop configuration, user configured addresses will be needed for AL_PAs in order to insure that known addresses are provided between loop reconfigurations.

With respect to addressing, FCP and SCSI 2 systems employ different methods of addressing target devices. Additionally, the inclusion of a storage router means that a method of translating device IDs needs to be implemented. In addition, the storage router can respond to commands without passing the commands through to the opposite interface. This can be implemented to allow all generic FCP and SCSI commands to pass through the storage router to address attached devices, but allow for configuration and diagnostics to be performed directly on the storage router through the FC and SCSI interfaces.

Management commands are those intended to be processed by the storage router controller directly. This may include diagnostic, mode, and log commands as well as other vendor-specific commands. These commands can be received and processed by both the FOP and SCSI interfaces, but are not typically bridged to the opposite interface. These commands may also have side effects on the operation of the storage router, and cause other storage router operations to change or terminate.

A primary method of addressing management commands though the FCP and SCSI interfaces can be through peripheral device type addressing. For example, the storage router can respond to all operations addressed to logical unit (LUN) zero as a controller device. Commands that the storage router will support can include INQUIRY as well as vendor-specific management commands. These are to be generally consistent with SCC standard commands.

The SCSI bus is capable of establishing bus connections between targets. These targets may internally address logical units. Thus, the prioritized addressing scheme used by SCSI subsystems can be represented as follows: BUS:TARGET:LOGICAL UNIT. The BUS identification is intrinsic in the configuration, as a SCSI initiator is attached to only one bus. Target addressing is handled by bus arbitration from information provided to the arbitrating device. Target addresses are assigned to SCSI devices directly through some means of configuration, such as a hardware jumper, switch setting, or device specific software configuration. As such, the SCSI protocol provides only logical unit addressing within the Identify message. Bus and target information is implied by the established connection.

Fibre Channel devices within a fabric are addressed by a unique port identifier. This identifier is assigned to a port during certain well-defined states of the FC protocol. Individual ports are allowed to arbitrate for a known, user defined address. If such an address is not provided, or if arbitration for a particular-user address fails, the port is assigned a unique address by the FC protocol. This address is generally not guaranteed to be unique between instances. Various scenarios exist where the AL-PA of a device will change, either after power cycle or loop reconfiguration.

The FC protocol also provides a logical unit address field within command structures to provide addressing to devices internal to a port. The FCP_CMD payload specifies an eight byte LUN field. Subsequent identification of the exchange between devices is provided by the FQXID (Fully Qualified Exchange ID).

FC ports can be required to have specific addresses assigned. Although basic functionality is not dependent on this, changes in the loop configuration could result in disk targets changing identifiers with the potential risk of data corruption or loss. This configuration can be straightforward, and can consist of providing the device a loop-unique ID (AL_PA) in the range of “01 h” to “EFh.” Storage routers could be shipped with a default value with the assumption that most configurations will be using single storage routers and no other devices requesting the present ID. This would provide a minimum amount of initial configuration to the system administrator. Alternately, storage routers could be defaulted to assume any address so that configurations requiring multiple storage routers on a loop would not require that the administrator assign a unique ID to the additional storage routers.

Address translation is needed where commands are issued in the cases FC Initiator to SCSI Target and SCSI Initiator to FC Target. Target responses are qualified by the FQXID and will retain the translation acquired at the beginning of the exchange. This prevents configuration changes occurring during the course of execution of a command from causing data or state information to be inadvertently misdirected. Configuration can be required in cases of SCSI Initiator to FC Target, as discovery may not effectively allow for FCP targets to consistently be found. This is due to an FC arbitrated loop supporting addressing of a larger number of devices than a SCSI bus and the possibility of FC devices changing their AL-PA due to device insertion or other loop initialization.

In the direct method, the translation to BUS:TARGET:LUN of the SCSI address information will be direct. That is, the values represented in the FCP LUN field will directly map to the values in effect on the SCSI bus. This provides a clean translation and does not require SCSI bus discovery. It also allows devices to be dynamically added to the SCSI bus without modifying the address map. It may not allow for complete discovery by FCP initiator devices, as gaps between device addresses may halt the discovery process. Legacy SCSI device drivers typically halt discovery on a target device at the first unoccupied LUN, and proceed to the next target. This would lead to some devices not being discovered. However, this allows for hot plugged devices and other changes to the loop addressing.

In the ordered method, ordered translation requires that the storage router perform discovery on reset, and collapses the addresses on the SCSI bus to sequential FSP LUN values. Thus, the FCP LUN values 0−N can represent N+1 SCSI devices, regardless of SCSI address values, in the order in which they are isolated during the SCSI discovery process. This would allow the FCP initiator discovery process to identify all mapped SCSI devices without further configuration. This has the limitation that hot-plugged devices will not be identified until the next reset cycle. In this case, the address may also be altered as well.

In addition to addressing, according to the present invention, the storage router provides configuration and access controls that cause certain requests from FC Initiators to be directed to assigned virtual local storage partitioned on SCSI storage devices. For example, the same request for LUN 0 (local storage) by two different FC Initiators can be directed to two separate subsets of storage. The storage router can use tables to map, for each initiator, what storage access is available and what partition is being addressed by a particular request. In this manner, the storage space provided by SCSI storage devices can be allocated to FC initiators to provide virtual local storage as well as to create any other desired configuration for secured access.

Although the present invention has been described in detail, it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims. 

1. A method for configuring virtual local storage comprising: configuring a map at a management station that maps between host devices and remote storage devices remote from the host devices, wherein the map is configured for a routing device that implements access controls for storage space on the remote storage devices in accordance with the map and allows access from host devices connected to a serial transport medium to the remote storage devices connected to the second transport medium through using low level, block protocols; and communicating the map from the management station to the routing device.
 2. The method of claim 1, wherein the map allocates subsets of storage space to associated hosts devices.
 3. The method of claim 1, wherein the map maps from a host identification to a virtual address for at least a portion of an associated remote storage device.
 4. The method of claim 1, wherein the map maps from a host identification to a physical address for at least a portion of an associated remote storage device.
 5. The method of claim 1, wherein the management station connects to the routing device via an Ethernet connection.
 6. The method of claim 1, wherein the serial transport medium is an Ethernet transport medium, wherein the host device is operable to communicate using the iSCSI protocol, and wherein the first controller receives an iSCSI communication from the host device, the iSCSI communication comprising a SCSI command, and the routing device forwards the SCSI command to the one or more remote storage devices or portions thereof for which the host device is allowed access.
 7. The method of claim 1, further comprising receiving error information at the management station from the routing device.
 8. A method of configuring virtual local storage comprising: connecting a management station to a routing device; establishing a set of configuration information that associates a host device connected to a serial transport medium and at least a portion of a remote storage device connected to a second transport medium for controlling access to the at least a portion of the remote storage device; sending the configuration information from the management station to a routing device; and storing the configuration information in a memory at the routing device, wherein the routing device is configured to receive a low level block protocol request from the host device to the remote storage device and control access between the host device and the remote storage device in accordance with the configuration information and forward the low level block protocol request to the at least a portion of the remote storage device if the host device is determined to be allowed access to the at least a portion of the remote storage device according to the configuration information.
 9. The method of claim 8, wherein the configuration information comprises one or more tables that map an identification for the host device to a physical address for the at least a portion of the remote storage device.
 10. The method of claim 8, wherein the serial transport medium is an Ethernet transport medium, wherein the low level block protocol is SCSI, wherein the SCSI low level bock protocol is encapsulated in an iSCSI transport protocol, and the routing device forwards allowed SCSI request to the remote storage device.
 11. The method of claim 8, wherein the management station connects to the routing device via an Ethernet connection.
 12. The method of claim 8, further comprising receiving error information at the management station from the routing device.
 13. A system for providing virtual local storage on remote storage devices to host devices connected to a serial transport medium comprising: a management station, the management station operable to allow a user to define a map for a routing device that controls access from host devices connected to a serial transport medium to remote storage devices connected to a second transport medium and allows access from host devices connected to the serial transport medium to the remote storage devices connected to the second transport medium through using low level, block protocols; a routing device coupled to the management station via a management transport medium, the routing device operable to: receive the map from the management station and store the map in a memory; implement access controls for storage space on the remote storage devices in accordance with the map; and allow access from host devices to the remote storage devices through using native low level block protocols.
 14. The system of claim 13, wherein the management transport medium is one of the first or second transport media.
 15. The system of claim 13, wherein the management station is further configured to configure the routing device to maintain an allocation of subsets of remote storage space to associated hosts device connected to the serial transport medium so that each subset is only accessible by the associate host device.
 16. The system of claim 14, wherein the management transport medium is an Ethernet transport medium.
 17. The system of claim 11, wherein the map allocates subsets of storage space to associated hosts devices.
 18. The system of claim 11, wherein the map maps from a host identification to a virtual address for at least a portion of an associated remote storage device.
 19. The system of claim 11, wherein the map maps from a host identification to a physical address for at least a portion of an associated remote storage device.
 20. A management station comprising: an interface to connect to a management transport medium; a processor; and a computer readable medium accessible by the processor, the computer readable medium storing a set of computer instructions comprising instructions executable by the processor to: provide an interface to allow a user to modify a set of configuration information for a routing device, wherein the configuration information maps between host devices connected to a serial transport medium and remote storage devices connected a second transport medium and is configured for use by the routing device to implement access controls in accordance with the configuration information and to allow access from host devices to the remote storage devices through using native low level block protocol; update the set of configuration information based on input from the user; and communicate the set of configuration information to the routing device over the management transport medium.
 21. The management station of claim 20, wherein the management station wherein the configuration information is operable to configure the routing device to maintain an allocation of subsets of storage space to associated hosts device connected to the serial transport medium so that each subset is only accessible by the associate host device.
 22. The management station of claim 20, wherein the management transport medium is one of the serial or second transport media.
 23. The management station of claim 20, wherein the management transport medium is an Ethernet transport medium.
 24. The management station of claim 20, wherein the map maps from a host identification to a virtual address for at least a portion of an associated remote storage device.
 25. The management station of claim 20, wherein the map maps from a host identification to a physical address for at least a portion of an associated remote storage device.
 26. A software product comprising a computer readable medium storing a set of computer instructions comprising instructions executable by a processor to: provide an interface to allow a user to modify a set of configuration information for a routing device that maps between host devices connected to a first transport medium and remote storage devices connected a second transport medium, wherein the set of configuration information defines a map that maps the host devices to the remote storage devices and that is for use by the routing device to implement access controls to allow access from host devices to the remote storage devices through using native low level block protocol; and communicate the set of configuration information to the routing device.
 27. The software product of claim 26, wherein map maps from a host identification to an address for at least a portion of an associated remote storage device.
 28. A storage network comprising: a first transport medium; a second transport medium, wherein at least one of the first transport medium or second transport medium is a serial transport medium; a set of hosts connected to the first transport medium, wherein each host is configured to issue requests according to a native low level block protocol; a set of remote storage devices connected to the second transport medium; a routing device configured to: maintain a set of configuration information that associates hosts connected to the transport medium with storage space on remote storage devices connected to the second transport medium and allow modification of the configuration information by a remote storage device; provide virtual local storage to the host devices in a manner so that the remote storage devices appear to the host devices so as to have the appearance of locally attached storage; receive requests from the host devices according to the native low level block protocol; and for a request received from an issuing host, access a set of configuration information and forward using a low level block protocol the request to a remote storage device if the issuing host is associated with the requested storage space according to the configuration information.
 29. The storage network of claim 28, wherein the hosts comprise a set of workstations.
 30. The storage network of claim 28, wherein the remote storage devices comprise hard disk drives.
 31. The storage network of claim 28, wherein the set of configuration information associates host identifiers with a virtual addresses for storage space on the set of remote storage devices.
 32. The storage network of claim 31, wherein the set of configuration information associates the virtual addresses with physical addresses for storage space on the set of remote storage devices.
 33. The storage network of claim 28, wherein the configuration information allocates subsets of storage space to associated hosts and wherein the routing device is configured to only allow access to a subset of storage space to associated hosts.
 34. The storage network of claim 28, wherein the routing device stores the configuration as one or more tables in Flash memory.
 35. The storage network of claim 28, wherein the request is a SCSI request.
 36. The storage network of claim 35, wherein the first transport medium is an Ethernet transport medium, wherein the SCSI request is encapsulated in an iSCSI transport protocol, and wherein the routing device receives an iSCSI communication from the iSCSI device and forwards the SCSI request to the remote storage device if the SCSI request is allowed.
 37. The storage network of claim 28, wherein the remote storage devices comprise SCSI, Fibre Channel, ATA, SATA or Serial Attached SCSI storage devices and wherein the supervisor unit forwards a low level block protocol command to the remote storage devices.
 38. A storage network, comprising: a first transport medium; a second transport medium, wherein at least one of the first or second transport medium is a serial transport medium; a plurality of workstations connected to the first transport medium; a plurality of remote storage devices connected to the second transport medium; and a routing device interfacing between the first transport medium and the second transport medium, the routing device providing virtual local storage on the remote storage devices to the workstations and operable: to map between the workstations and the remote storage devices; to implement access controls for storage space on the remote storage devices; and to allow access from the workstations to the remote storage devices using low level, block protocol in accordance with the mapping and access controls.
 39. The storage network of claim 38, wherein the access controls include an allocation of subsets of storage space to associated workstations, wherein each subset is only accessible by the associated workstation.
 40. The storage network of claim 38, wherein the map creates a path between unique identifiers associated with each of the workstations to unique identifiers associated with the remote storage devices.
 41. The storage network of claim 38, wherein the remote storage devices comprise SCSI storage devices.
 42. The storage network of claim 38, wherein the remote storage devices comprise Fibre Channel storage devices.
 43. The storage network of claim 38, wherein the remote storage devices comprise ATA storage devices.
 44. The storage network of claim 38, wherein the remote storage devices comprise SATA storage devices.
 45. The storage network of claim 38, wherein the remote storage devices comprise SAS storage devices.
 46. The storage network of claim 38, wherein the first transport medium is an Ethernet transport medium operable to transport iSCSI protocol communications.
 47. The storage network of claim 38, wherein the first transport medium is a Fibre Channel transport medium operable to transport Fibre Channel protocol communications.
 48. A storage network method, comprising: at a workstation connected to a serial transport medium, sending a communication containing a command according to a native low level block protocol to virtual local storage; at a routing device interfacing between the first transport medium and a second transport medium: mapping between workstations connected to the serial transport medium and remote storage devices connected to the second transport medium; receiving the communication from the workstation; determining if the workstation is associated storage space on the remote storage devices; and forwarding the native low level block command to an appropriate remote storage device if the workstation is associated with storage space on that remote storage device; and at a remote storage device connected to the routing device, returning a response according to the native low level block protocol if the command is received.
 49. The storage network method of claim 48, further comprising remapping between workstations and remote storage devices.
 50. The storage network method of claim 48, further comprising encapsulating the native low level block protocol in a transport protocol at the issuing workstation.
 51. The storage network of claim 50, wherein the native low level block protocol is encapsulated in one of an iSCSI protocol or a Fibre Channel protocol at the workstation.
 52. A data storage gateway capable of interfacing with and providing connectivity and mapping between a serial interface connected to a first transport medium and a second interface connected to a second transport medium, the data storage gateway comprising: a set of remote storage devices; a configurable gateway device in communication with the remote storage device, the routing device configured to: maintain a set of configuration information that associates each of a set of hosts with a subset of storage space on the set of remote storage devices; present to each host device the subsets of storage space associated with that host device according to the configuration information as if the subsets of storage space are locally attached to that host device; implement access controls to the storage space in accordance with configuration information; and allow each host to communicate with remote storage devices containing subsets of storage space associated with that host using a native low level block protocol.
 53. The data storage gateway of claim 52, wherein the gateway device is configured to receive a communication containing a low level block protocol command from an issuing host, determine if the issuing host is associated with target storage space based on a host identification for the issuing host and an address associated with the target storage space, and if the issuing host is associated with the target storage space, forward the native low level block command to the remote storage device containing the subset of storage space.
 54. The data storage gateway of claim 52, wherein the gateway device is configurable to reallocate subsets of storage space to host devices.
 55. The data storage gateway of claim 52, wherein the remote storage devices comprise SCSI storage devices.
 56. The data storage gateway 52, wherein the remote storage devices comprise Fibre Channel storage devices.
 57. The data storage gateway 52, wherein the remote storage devices comprise ATA storage devices.
 58. The data storage gateway 52, wherein the remote storage devices comprise SATA storage devices.
 59. The data storage gateway 52, wherein the remote storage devices comprise SAS storage devices.
 60. The data storage gateway 52, wherein the serial transport medium is an Ethernet transport medium operable to transport iSCSI protocol communications.
 61. The data storage gateway of claim 52, wherein the first transport medium is a Fibre Channel transport medium operable to transport Fibre Channel protocol communications. 